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Northwest Africa 6554
Basic information Name: Northwest Africa 6554
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 6554
Observed fall: No
Year found: 2010
Country: Morocco
Mass:help 138 g
Classification
  history:
Meteoritical Bulletin:  MB 99  (2011)  Lunar (feld. brec.)
Recommended:  Lunar (feldsp. breccia)    [explanation]

This is 1 of 174 approved meteorites classified as Lunar (feldsp. breccia).   [show all]
Search for other: Lunar meteorites
Comments: Approved 28 Apr 2011
Writeuphelp
Writeup from MB 99:

Northwest Africa 6554 (NWA 6554)

Morocco

Found: 2010

Classification: Lunar meteorite (feldspathic breccia)

History: A 113 g stone (NWA 6252), a 138 g stone (NWA 6554) and a 29.72 g stone (NWA 6555), all partially crusted and minimally weathered, were purchased in Morocco by A. Aaronson in 2010. These stone are from the same locality as NWA 2995 and its pairings.

Petrography: (T. Bunch and J. Wittke, NAU): Same general description as given for NWA 2995 and 6252. A feldspathic breccia that contains anorthositic, noritic, gabbros, olivine basalts, troctolites, granulitic breccias, and KREEPy-like lithologies. Breccia-in-breccia structures, impact melts and veins are common. Moderately to heavily shocked, weathering grade is low.

Geochemistry: Anorthosite plagioclase An92.4-95.6; troctolite olivine, Fa32.2 (FeO/MnO = 96); olivine fragment, Fa36.6 (FeO/MnO = 89). Chemistry (R. Korotev, WUSL): Na2O = 0.44 wt% and FeO = 11.3 wt% and trace elements (ppm) Sc = 20, Sm = 4.11, Eu = 0.97, Th = 1.38.

Classification: Achondrite (Lunar, feldspathic breccia). Paired with NWA 2995.

Specimens: 20.7 g is on deposit at NAU. An anonymous collector holds the main mass.

Data from:
  MB99
  Table 0
  Line 0:
Date:2010
Mass (g):138
Pieces:1
Class:Lunar (feldsp. breccia)
Classifier:Bunch/Wittke
Type spec mass (g):20.7
Type spec location:NAU
Main mass:anonymous
Comments:Submitted by Bunch
Institutions
   and collections
NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
WUSL: Washington Univ., One Brookings Drive, St. Louis, MO 63130, United States (institutional address; updated 17 Oct 2011)
Aaronson: Sahara Overland Ltd., Harhora, Temara, 12000, Morocco (private address; updated 3 Jan 2010)
Catalogs:
References: Published in Meteoritical Bulletin, No. 99, April 2012, MAPS 47, E1-E52 (2012) [published online only]
Find references in NASA ADS:
Find references in Google Scholar:
Geography:

Morocco
Coordinates:Unknown.

Statistics:
     This is 1 of 1386 approved meteorites from Morocco (plus 16 unapproved names) (plus 1 impact crater)

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